Calcium salt of dibrombehenic acid.



EMIL FISCHER, OF BERLIN, GERMANY, ASS 3-NOR TO FARBENFABRIKEN ll ORM. FRIEDR.

BAYER d: 00., GF'ELBERFELD, GERM CALCHTM SALT 13F DIBBOXIEBEIENKC ACID.

To all whom it may concern:

Es it known that l, EMIL- FISCHER, pro-- lessor of chemistry, citizen ol' the iioiman' dibronioohonio sold gives a solid, stable, tasteless and odorless osmium salt which is a valuable. substitute for potassium bioinul, an average (loss being from 1 to 2 grams.

My new preparation is obtained by oom (1 'vortmg the free dibi'ombehenio ocio oi; its

alkaline salts into the calcium salt.

The. dibrombshenio said is prepared by ti'eatingsrucio acid with biomin. w

Tlie'prepa 'stion of the calcium salt of ill-- broinoehenic acid is carried out is follows, the parts being by Weight:

' Example 1: ports of crystallized ol lorid of calcium containing of crystallizn tion are dissolved in 159 parts of hot alcohol and on excess of gaseous ommonis is passed through the liquid; When tho-precipitation p i oi ammonium oliloi'id has been completed,

1% ports of slcohol (92%) 3E8 sddedi. .It is tlioii cooled to ordinary tempoisturs. To the cold mixture a solution of imits of [iilircomlielistoio acid in, 260 parts of alcohol is slowly soliiorlduring stirring. Tliocaloium salt of iiibroiiibehenio sold separates out in the shops o5? s-wlnts' voluminous precipitate.

It filtered oifwith suction, pressed, washed with slooiiol, iiixeii up. by stirring with sold WilbBI, iiitsi'oil' ofi' with: suotion and subsequiitly Washed with. water until the Wash- Wot i is ireo iromchloiriii. with alcohol oiicl dried in "00mm. The caloiuin sol? tl gis obtained-is o white, tasteless and oiloilsss powilef almost insoluble in our to: oil slcoiiol. It has the formula:

Example 2: Tl'is'ssme salt results by the interaction of? so alkaline salt of clibrom- Erpecifistion of Letters Patent.

Application filed Augus 12, 19553.

It is then Washed.

Serial No. lsfiw. (Specimens) solution. For this purpose dibi'oni sslionio is oissolveii in caustic potash by shaking it at ordiifmi'y temperature with highly (lilutod oo-ustio potzisli (about 1/40 normal). The calculated quantity of a dilute aqueous solution of oliloi-id of calcium is added to the solution, .Etlll'l it is stirrod'until the colorless filo-coolant foi'ooiiits-te has settled. It is ties-too as described in Example 1.

Example 3: 1 port of molten di oroin'- botanic said is shaken ot'oidirisry tompora tors and is: sovo'i'ol with 180 parts of a saturated aqueous solution of osljciuin hyi The resulting calcium salt, which is filtered off and is than hosted with alcohol to dissolve the free acid and carefully mixed up with tlioliquid by stirring. After cooling the salt forms a White powder which is fit tori-ed ofi, washecl witli alcohol, and dried 'it mono. w v

The. Yield of tho slvovo process is very good, being itbGV6'-90% oi. the calculated tlisogetic-ol figures.

Moving now dosoriboil my invention and in what manner the some is to bs performed,

what Iolsim as new and desire to secure by bI'OIHlDBhGXilC soirl oi the following formula olitsinolile by treating (libroinbshonio acid with chlorirl of calcium, which calcium salt is a whitesolid body, tasteless, odorless and almost insoluble in water, insoluble in alcohol but soluble; in other and chloroform and which is a mliisble substitute for potassium bromid, substantially, as horoinliefore (lescribed. Y A i In testimony whereof l have hereunto set my hand in the presence of two subscribing witnesses.

. EMLL FISCHER.

Witnessos2 HENRY I'lAsPER, Amsos SOHRGEDER.

Patented .i3.pril 13, 1909,

still contains small amounts of the frso acid, 

